If I receive plain text and then encrypt it with the public key of the receiver I can no longer decrypt it myself. I have no idea about how Lavabit operated bu

If I receive plain text and then encrypt it with the public key of the receiver I can no longer decrypt it myself. I have no idea about how Lavabit operated but that's the service I would offer. With SSL only on the incoming port then interception is in the hands of the sender (modulo errors in SSL).